Behind the ring, a banner bears his name, and when he enters Gleason's Gym--a slight figure in baggy jeans and red leather jacket--the fighters pounding the bags stop to pay their respects. Here, under the Brooklyn Bridge, where so many legends trained, Zab Judah reigns as a local hero. Since turning pro at 18, he is 25-0. In his last bout, on the Mike Tyson undercard in October, he devastated his opponent with rapid-fire...